Tổng quan về LTE và WiMAX

Các khán giả mục tiêu của bài viết này được quản lý và nhân viên kỹ thuật từ ngành công nghiệp viễn thông và mạng, đặc biệt là các nhà hoạch định chính sách và kỹ sư làm việc trên sự phát triển của công nghệ không dây thế hệ tiếp theo, các học sinh từ nền tảng khoa học máy tính và điện, và bất cứ ai quan tâm đến trong một nghiên cứu so sánhhai ứng cử hàng đầu cho các công nghệ 4G truy cập băng rộng không dây: LTE và WiMAX....
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Tổng quan về LTE và WiMAX LTE and WiMAX Comparison Tejas Bhandare tbhandare@scu.edu tbhandare@yahoo.com Santa Clara University December 2008 LTE and WiMAX Comparison Audience The target audiences of this paper are the Management and Technical personnel from Telecommunications and Networking industry, especially decision makers and engineers working on the development of next-generation wireless technologies, students from Electrical and Computer Science background, and anyone interested in a comparative study of the two leading contenders for 4G broadband wireless access technologies: LTE and WiMAX. 1 Tejas Bhandare LTE and WiMAX Comparison Contents Audience…………………………………………………………………………………..1 Overview………………………………………………………………………………….4 Introduction………………………………………………………………………………5 System Architecture……………………………………………………………………...7 The LTE Architecture……….…………………………………………………………..7 Baseline……………………………………………………………………………7 Towards LTE………………………………………………………………………8 System Architecture Evolution (SAE)…………………………………………..10 Seamless migration……………………………………………………………....11 The WiMAX Architecture………………………………………..…………………….12 Network Reference Model……………………………………………………...12 Seamless integration with 3GPP networks……………………………………..15 Air Interface Radio Aspects……………………………………………………………..18 Frequency bands…….………………………………………………………………...18 Radio Access Modes.………………………………………………………………….18 Data rates……………………………………………………………………………...18 Multiple Access Technology….……………………………………………………….18 OFDMA (WiMAX Uplink/Downlink and LTE Downlink) ………………………..19 SC-FDMA (LTE uplink) …………………………………………………………...21 Modulation Parameters………………………………………………………………22 LTE………………………………………………………………………………..22 WiMAX…………………………………………………………………………...23 Multiple Antenna Techniques………………………………………………………..24 LTE………………………………………………………………………………..25 WiMAX…………………………………………………………………………...26 Air Interface Protocol Aspects………………………………………………………….29 Protocol Architecture………………………………………………………………...29 LTE……………………………………………………………………………….29 WiMAX……………………………………………………………………………31 Frame Structure……………………………………………………………………….32 LTE………………………………………………………………………………..32 WiMAX…………………………………………………………………………...33 Physical Channelization and Mapping………………………….…………………….35 LTE………………………………………………………………………....…….35 WiMAX…………………………………………………………………………...39 Modulation……………………………………………………………………………42 LTE…………………………………………………………………………….....42 WiMAX…………………………………………………………………………...43 Physical Layer Control Mechanisms……….…………………………………………43 LTE……………………………………………………………………………….43 2 Tejas Bhandare LTE and WiMAX Comparison WiMAX…………………………………………………………………………...44 Quality of Service (QoS) ………………………………………………………………..45 Security…………………………………………………………………………………..45 Comparison Summary…………………………………………………………………..46 Market Analysis and challenges………………………………………………………...48 Conclusion……………………………………………………………………………….50 Acronyms………………………………………………………………………………...51 References……………………………………………………………………………….57 3 Tejas Bhandare LTE and WiMAX Comparison Overview Over the last few years, there has been increasing demands for accessing the Internet over the mobile devices. To address this, the wireless telecommunication industry has been striving hard to define a new air interface for mobile communications to provide a framework for high mobility broadband services and increase the overall system capacity; reducing latency; and improving spectral efficiency and cell-edge performance. Two emerging technologies, the IEEE 802.16 WiMAX (Worldwide Interoperability for Microwave Access) and the 3GPP LTE (Third Generation Partnership Project Long Term Evolution) aim to provide mobile voice, video and data services by promoting low cost deployment and service models through Internet friendly architectures and protocols. Both these technologies are being considered as candidates for the fourth generation (4G) of mobile networks. This paper performs a detailed comparison of the LTE and WiMAX standards and delves into the intricacies of each of them. The paper begins with a brief history and technology overview of WiMAX and LTE. It then performs a detailed comparison of the System Architecture for each and also discusses the seamless integration of LTE and WiMAX technologies into the evolved 3GPP networks. It performs a detailed study of the Air Interface Radio Aspects such as access modes, transmission bandwidths, sup ...